@Kenjamin1 MI I recommend reading the first few sections of this. Basically you have two teams with a racer on each and three blockers on each. The racers try to complete laps while being blocked by the opposing team. Thus, the maps that are played have to be uncheatable and easy to race/block on. There are several examples in the gallery. I haven't bothered to make a guide on how to set up the gametype because there doesn't seem to be a demand at the moment.

Ok these are my findings when submitting a map.
1. Map magnet should be called download link, or content browser link.
2. While submitting a map magnet link, you shouldn't be able to proceed without submitting one. *Create a cancel button. *If you submit without a link, no entry should exist.
3. You cannot upload more than one image in the entry process.
4. You cannot edit the images after creating an entry.
5. At any point in the entry submission process, if you exit or press the back button, it will create an entry. Not good because it should delete it if it is incomplete.
6. Not very obvious where to type in the map name, it doesn't look like a text field unless you click on it.
***General user friendliness i.e. retardproofing is not present in submitting a map.
You should create a forum topic telling people what to do, it is not as polished as Forgehub - which is not a joke.

http://www.halotracks.org/forum/index.php?app=maps&module=view&section=view&id=2087
@Mad Hatter
Halo: MCC did not have this map, Halo 4 did. There's a logo on the map post that is assigned to each map post that tells you what game it is from. This happened across the gallery. Is that simpler for you?

I already talked to Hatter in the shoutbox about demo maps not in the demo category.
However - there seems to be an issue with certain maps (might be all of them), not having the correct game logo on the map post. For example, Acrophobia, which is a Halo 4 map, was assigned to the Master Chief Collection when it is only available on Halo 4. There are many like this...